EP0313789A1 - Procédé et appareil pour l'affichage de données des couleurs à trois dimensions dans un système de référence à une dimension - Google Patents

Procédé et appareil pour l'affichage de données des couleurs à trois dimensions dans un système de référence à une dimension Download PDF

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Publication number
EP0313789A1
EP0313789A1 EP19880115124 EP88115124A EP0313789A1 EP 0313789 A1 EP0313789 A1 EP 0313789A1 EP 19880115124 EP19880115124 EP 19880115124 EP 88115124 A EP88115124 A EP 88115124A EP 0313789 A1 EP0313789 A1 EP 0313789A1
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EP
European Patent Office
Prior art keywords
color
index
data
values
true
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19880115124
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German (de)
English (en)
Other versions
EP0313789B1 (fr
Inventor
John Charles Dalrymple
Scott William Bigger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tektronix Inc
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Tektronix Inc
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Publication date
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Publication of EP0313789A1 publication Critical patent/EP0313789A1/fr
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • G09G5/06—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed using colour palettes, e.g. look-up tables

Definitions

  • This invention relates generally to the display of color images on a computer terminal and, more particularly, to a method of processing, storing, and referencing data representing image color.
  • image color data are stored as R,G,B (red, green, blue) color component values in predetermined memory locations.
  • red values are stored in one group of memory locations, green values in another, and blue values in a third group.
  • the user usually specifies a color number or index.
  • the index which represents a single (one-dimensional) address, permits access to the particular set of RGB values representing the selected color.
  • RGB color values themselves (rather than color numbers or indexes) to represent a selected color.
  • the "color values” approach is representative of the true color system--a three-dimensional color referencing system.
  • the "color number” approach is representative of the index color system--a one-dimensional color referencing system.
  • True color systems are generally used to produce shaded images, to display scanned-in images, and to simulate physical phenomena such as colored lights illuminating a scene composed of colored objects.
  • Indexed color systems are generally used to depict color of icon symbols, to represent scalar values, or to distinguish image segments (e.g.,. primitives such as points, lines, arcs, circles, rectangles, polygons, and text).
  • a method and apparatus which provides for the display of both true-color images and index color images.
  • the user may specify either a color number to denote index color, or RGB color values to denote true color.
  • Index color operations and true color operations are performed in an index color environment.
  • the apparatus computes one-dimensional index-type data from user-supplied three-dimensional true color data. The user specifies the number of color levels to be used in representing the range of displayable red, green and blue colors, and specifies the RGB values of the color to be displayed.
  • the apparatus derives true color data (RGB color level values) from the number of color levels specified by the user, stores the derived data in memory in a predetermined arrangement suitable for referencing by a single address or index, and derives from the user-specified RGB values a single address for referencing the stored data.
  • RGB color level values true color data
  • the apparatus comprises a keyboard and a port to a host computer for inputting index color data and true color data, a processing means coupled to the keyboard and/or host computer for producing index-type data from true color data, a memory means for storing the input data and data produced by the processing means, and a display means for displaying stored data.
  • Fig. 1 shows a system of the prior art capable of performing index color operations.
  • Fig. 2 shows a color map memory of the system, RGB data typically stored in the memory, and a one-dimensional (single color index) address scheme for referencing stored data.
  • Fig. 3 shows a three-dimensional address scheme of the prior art for referencing stored data. From user-supplied RGB values stored in image memory, references are made to color values stored in three look-up tables (LUTs).
  • Fig. 2 shows a one address (index) scheme, while Fig. 3 shows a three address (true color) scheme.
  • Fig. 4 shows a true-color one-address scheme, the scheme utilized by the apparatus of the present invention.
  • the apparatus of the present invention is capable of performing index color operations.
  • the apparatus is capable of performing true color operations in an index color environment.
  • the apparatus comprises a keyboard 10 and port to a host computer for inputting index color data and true color data, a processing means 11 coupled to the keyboard and/or host computer for producing index-type data from true color data, a memory means 13 for storing the input data and data produced by the processing means, and a display means 15 for displaying stored data.
  • the processing means 11 includes a microprocessor 12 " having a ROM (read only memory, not shown) with a stored program, and a vector generator 18.
  • the memory means 13 includes a memory 14 for storing index information, a video display memory 20, and a color map memory 22.
  • the display means 15 includes a video timing and control circuit 16, and a CRT (cathode ray tube) display with associated deflection circuit and D to A (digital-to-analog) converter.
  • the apparatus of the present invention is much like the system described in U.S. patent 4,509,043 for performing index operations, and the description of that system applies as well to the present apparatus. However, in the performing of true color operations in and color map memory of the present apparatus are designed to operate differently from said system, as described below.
  • Fig. 5 shows color map memory 22 of the present apparatus in greater detail.
  • the RGB values are arranged in tabular form in memory, with each memory location containing one set of R,G,and B values addressable by a single address.
  • the RGB values in the tables are calculated (derived) by the apparatus from data supplied to the apparatus. The calculation is performed by processor 12 under control of the stored program. (Examples of the stored program are presented in Appendixes A and B.)
  • the single address used to reference the RGB values in the table is derived by processor 12 of the apparatus from RGB values specified by the user.
  • both the RGB table values and the single address for referencing the RGB table values are derived by the apparatus.
  • the initial user of the apparatus specifies the RGB color values to be used in populating the table, by uniformly quantizing the closed interval from zero to one for each color.
  • the user may specify the number of the displayable levels to be Q (i.e., Q discrete quantization levels of red, green, and blue displayable primary colors).
  • the apparatus calculates the actual table entries (i.e., the true-color RGB values which, when referenced subsequently by a single index-type address, produces the original user-specified values).
  • one set of displayable primary color levels may be:
  • the five quantization levels occupy the range from 0% to 100% of displayable red; green, and blue primary colors.
  • the range of displayable colors may be viewed as a three-dimensional color space, where (0,0,0) represents black, i.e., 0% red, 0% green, 0% blue, (1,0,0) represents 100% red, (0,1,0) represents 100% green, (0,0,1) represents 100% blue, and (1,1,1) represents white, i.e., 100% red, 100% green and 100% blue.
  • the user of the apparatus may select:
  • the apparatus when representing a true-color object within the limits of the displayable colors of the apparatus. From the displayable levels specified by the user, the apparatus derives (calculates) color values suitable for single index referencing (single addressing), and stores the derived values in tables in memory for later use.
  • the apparatus calculates the color values (table entries) and populates the RGB tables as follows:
  • RGB tables show color data produced (derived) by processor 12 in response to user-specified quantization levels.
  • Processor 12 stores the derived data in memory 22 in a predetermined sequence (arrangement), as shown in Table II below.
  • the address 86 would be derived by processor 12, permitting access to the correct RGB values in the table.
  • the method include the steps of deriving true color data (i.e., RGB color level values) from the number of color levels specified by the user, storing the derived data in memory in predetermined arrangement suitable for referencing by a single address or index, and deriving from user-supplier RGB color values a single address for referencing the stored data.
  • true color data i.e., RGB color level values
  • Appendix A shows RGB values, and associated single index addresses, derived for:
  • Appendix B shows RGB values, and associated single index addresses, derived for:
  • index and true color data are shown for both a single index surface (surface 1) and a true color surface (surface 2).
  • surface 1 index surface
  • surface 2 true color surface
  • the "00" represents a color index for surface 1
  • the "01 10 11 represents RGB color values for surface 2.
  • the address was computed (derived) from user-supplied index and true color values. The address is used to reference the RGB values "01010101 10101010 11111111".
  • the RGB values may differ for a given address. For example, given the computed address "01 11 11 11”, if the RGB values "10000000 10000000 10000000” had been predetermined to represent the color index "01”, and the RGB values "11111111 11111111 11111111 " had been predetermined to represent the RGB color level "11 11 11”, then the RGB values "10000000 10000000 10000000” would be used if the indexed color surface had priority, and the RGB values "11111111 11111111111 “ would be used if the true color surface had priority.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Image Generation (AREA)
  • Digital Computer Display Output (AREA)
  • Controls And Circuits For Display Device (AREA)
EP19880115124 1987-10-26 1988-09-15 Procédé et appareil pour l'affichage de données des couleurs à trois dimensions dans un système de référence à une dimension Expired EP0313789B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11303087A 1987-10-26 1987-10-26
US113030 1993-08-27

Publications (2)

Publication Number Publication Date
EP0313789A1 true EP0313789A1 (fr) 1989-05-03
EP0313789B1 EP0313789B1 (fr) 1992-11-25

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EP19880115124 Expired EP0313789B1 (fr) 1987-10-26 1988-09-15 Procédé et appareil pour l'affichage de données des couleurs à trois dimensions dans un système de référence à une dimension

Country Status (3)

Country Link
EP (1) EP0313789B1 (fr)
JP (1) JPH01147497A (fr)
DE (1) DE3876212T2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992010800A1 (fr) * 1990-12-11 1992-06-25 Eastman Kodak Company Appareil de traitement de donnees numeriques
EP0518669A1 (fr) * 1991-06-14 1992-12-16 Canon Kabushiki Kaisha Appareil d'enregistrement d'images en couleurs et procédé de conversion de couleur
WO1994016405A1 (fr) * 1992-12-31 1994-07-21 E.I. Du Pont De Nemours And Company Systeme d'afficgage adaptatif
US5579409A (en) * 1991-09-27 1996-11-26 E. I. Du Pont De Nemours And Company Methods for determining the exterior points of an object in a background
GB2418029B (en) * 2004-09-14 2009-04-29 Michael Bremer-Trainor 4-D Colour Chart

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0422296B1 (fr) * 1989-10-12 1995-01-11 International Business Machines Corporation Système d'affichage avec mode de couleur directe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0105724A2 (fr) * 1982-09-29 1984-04-18 Fanuc Ltd. Dispositif d'enregistrement de données pour une unité d'affichage graphique à couleurs
US4509043A (en) * 1982-04-12 1985-04-02 Tektronix, Inc. Method and apparatus for displaying images
EP0165441A2 (fr) * 1984-05-22 1985-12-27 International Business Machines Corporation Dispositif d'affichage d'images en couleur
US4578673A (en) * 1983-07-08 1986-03-25 Franklin Computer Corporation Video color generator circuit for computer

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60230693A (ja) * 1984-04-27 1985-11-16 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション カラ−画像表示システム
JPS62151894A (ja) * 1985-12-26 1987-07-06 富士通株式会社 カラ−多階調表示装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4509043A (en) * 1982-04-12 1985-04-02 Tektronix, Inc. Method and apparatus for displaying images
EP0105724A2 (fr) * 1982-09-29 1984-04-18 Fanuc Ltd. Dispositif d'enregistrement de données pour une unité d'affichage graphique à couleurs
US4578673A (en) * 1983-07-08 1986-03-25 Franklin Computer Corporation Video color generator circuit for computer
EP0165441A2 (fr) * 1984-05-22 1985-12-27 International Business Machines Corporation Dispositif d'affichage d'images en couleur

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992010800A1 (fr) * 1990-12-11 1992-06-25 Eastman Kodak Company Appareil de traitement de donnees numeriques
EP0518669A1 (fr) * 1991-06-14 1992-12-16 Canon Kabushiki Kaisha Appareil d'enregistrement d'images en couleurs et procédé de conversion de couleur
US5552905A (en) * 1991-06-14 1996-09-03 Canon Kabushiki Kaisha Image processing apparatus which selects a type of color processing for color image data based on a characteristic of the color image data
US5448652A (en) * 1991-09-27 1995-09-05 E. I. Du Pont De Nemours And Company Adaptive display system
US5579409A (en) * 1991-09-27 1996-11-26 E. I. Du Pont De Nemours And Company Methods for determining the exterior points of an object in a background
WO1994016405A1 (fr) * 1992-12-31 1994-07-21 E.I. Du Pont De Nemours And Company Systeme d'afficgage adaptatif
GB2418029B (en) * 2004-09-14 2009-04-29 Michael Bremer-Trainor 4-D Colour Chart

Also Published As

Publication number Publication date
DE3876212D1 (de) 1993-01-07
JPH01147497A (ja) 1989-06-09
DE3876212T2 (de) 1993-06-17
EP0313789B1 (fr) 1992-11-25

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